JP2003173161A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a plasma display device that a data driver is destroyed and the picture quality is deteriorated when the write frequency in one field is higher than a predetermined frequency. <P>SOLUTION: In the plasma display device, it is possible to suppress the power consumption of a data driver below a maximum rating and to prevent the picture quality from being deteriorated due to breakdown of the data driver by providing the device with a write frequency control means for deciding gradations to be used according to the frequency of a write operation to sub- fields in one field. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device that displays an image by controlling discharge.

[0002]

2. Description of the Related Art Generally, this type of plasma display device has a structure as shown in FIG. In FIG. 8, 1 is a plasma display panel (hereinafter referred to as PDP), 2
Is a data driver for inputting a signal to the data electrode of the PDP 1, 3 is a scan driver for inputting a signal to the scan electrode of the PDP 1, 4 is a sustain driver for inputting a signal to the sustain electrode of the PDP 1, and these data drivers 2 The scan driver 3 and the sustain driver 4 constitute a drive circuit.

Reference numeral 5 is an error diffusion means, 6 is a moving picture pseudo contour suppressing means, and 7 is a subfield conversion means for converting an input video signal into a signal in an order required by the PDP 1 and inputting it to the data driver 2.

FIG. 9 shows an example of a plasma display panel. As shown in FIG. 9, one glass substrate 8 is used.
First and second layers covered with the dielectric layer 9 and the protective film 10
The scan electrodes 11 and the sustain electrodes 12 as the row electrodes are formed so as to be parallel to each other. The other glass substrate 1
Data electrodes 15 as column electrodes covered with an insulating layer 14 are formed on the insulating layer 14, and partition walls 16 are provided on the insulating layer 14 between the data electrodes 15 in parallel with the data electrodes 15. A phosphor 17 is provided from the surface of the insulator layer 14 to the side surface of the partition wall 16. Further, the glass substrate 8 and the glass substrate 13 are disposed in the discharge space 1 so that the scan electrodes 11 and the sustain electrodes 12 and the data electrodes 15 are orthogonal to each other.
Discharge gas is enclosed in the discharge space 18 that is disposed opposite to each other with the discharge gas 8 interposed therebetween.

With such a structure, two adjacent two
A discharge cell is formed in the discharge space at the intersection of the data electrode 14 and the opposing scan electrode 11 and sustain electrode 12 sandwiched between the barrier ribs 16.

FIG. 10 shows an example of a timetable structure in a conventional driving method for driving this PDP. In this driving method, one field is composed of a plurality of subfields, for example, eight subfields, and each of these subfields is composed of a write period, a sustain period, and an erase initializing period, and one field is the first initial field. The conversion period is followed by a plurality of subfields.

FIG. 11 shows a gradation display method of a conventional plasma display device. Since the PDP utilizes the discharge phenomenon, the discharge cell has only two states, that is, lighting and non-lighting. Therefore, in order to perform halftone gradation expression, 1
The field is divided into multiple sub-fields, and each sub-field is given a weight corresponding to the emission brightness,
Gradation is expressed by controlling the presence or absence of light emission for each field.

For example, as shown in FIG. 11, one field is divided into five subfields, and the emission luminance weights of the respective subfields SF1 to SF5 are "1",
It is arranged as “2”, “4”, “8”, and “16”. In the case of expressing the gradation “15”, by performing the write operation in the write period in SF1, SF2, SF3, and SF4, the weights of the subfields are “1”, “2”, “4”, and “8”. The light emission maintaining operation corresponding to is performed, and the gradation “15” is expressed. Further, when expressing the gradation "16", the light emission maintaining operation corresponding to the gradation "16" is performed by performing the writing operation only in SF5.

In this way, when the gradation "15" is expressed, the number of write operations is four, whereas the gradation "16".
The number of write operations for expressing is 1 and the number of write operations differs depending on the gradation to be expressed. Also,
The power consumption of the data driver for applying the data voltage pulse to the data electrode is proportional to the number of write operations in one field.

[0010]

However, depending on the display gradation, it is necessary to perform the write operation in all subfields or most of the subfields constituting one field. In this case, the write operation is performed in one field. If the power consumption of the data driver increases in proportion to the number of times the power consumption is performed and the power consumption exceeds the maximum rating of the power consumption of the data driver, the data driver may be destroyed and the image cannot be displayed. For example, in one field, only the emission luminances of the subfields SF1 to SF5 are "1", "2", "4", "8", and "1", respectively.
If the number of times of writing in one field reaches 4 times or more and the maximum rating of the power consumption by the data driver is reached, the gradation is set to “2”.
3 ", SF1, SF2, SF3 and SF
It is necessary to perform the write operation in the write period of 5, but in this case, the number of writes in one field is four, which exceeds the maximum rating of the power consumption by the data driver. When expressing the gradation "24",
Since it can be expressed only by performing the write operation in the write periods of SF4 and SF5, the number of writes in one field is twice, and the maximum rating of power consumption by the data driver is not exceeded.

As described above, the number of write operations performed in one field varies depending on the gradation to be expressed, and there is a problem that the maximum rating of power consumption by the data driver may be exceeded depending on the gradation to be expressed.

The present invention has been made in view of the above problems, and suppresses the power consumption of the data driver and destroys the data driver by suppressing the number of writing times to a predetermined number or less even when expressing all gradations. The purpose is to prevent deterioration of image quality due to.

[0013]

In order to solve the above problems, the present invention is characterized in that a writing frequency control means for determining a gradation to be used is provided according to the number of writing operations of subfields in one field. And

As a result, the number of times of writing in one field can be adaptively controlled even when the subfield is composed of various emission luminance weights or when various gradations are input. It is possible to control the power consumption of the data driver due to the increase in the number of times of writing, and it is possible to prevent the data driver from being destroyed due to the increase in the power consumption and the resulting deterioration in image quality.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION That is, in the plasma display device according to the first aspect of the present invention, the first and second row electrodes are formed on one substrate facing each other and the first substrate is formed on the other substrate. , A plasma display panel in which discharge cells are provided at intersections by forming column electrodes so as to be substantially orthogonal to the second row electrodes, a drive circuit for driving the plasma display panel, and an input video signal And a subfield conversion means for converting into a signal of an order required by the display device and inputting the signal to the drive circuit, and a writing frequency control means for determining a gradation to be used according to the number of writing operations of the subfield in one field. It is characterized by being provided.

As a result, the number of writings in one field can be adaptively controlled even when the sub-fields of various emission luminance weights are formed or when various gradations are input. It is possible to control the power consumption of the data driver due to the increase of the power consumption, and to prevent the data driver from being destroyed due to the increase of the power consumption and the deterioration of the image quality.

Further, in the plasma display device according to the second aspect of the present invention, the writing number control means is arranged in front of the subfield converting means and has a writing number control table for limiting the writing number. With this, it is possible to determine an unused gradation before subfield conversion for a gradation in which the number of writing times in one field is a predetermined number or more, and to correct the unused gradation. Can be done at all times.

Further, in the plasma display device according to the third aspect of the present invention, the write count control means is arranged in the subsequent stage of the subfield conversion means, and the control signal from the write count control means is provided before the subfield conversion means. This is characterized by performing feedback in the case where the number of times of writing in one field is more than a predetermined number of times in the light emission pattern which is the output of the subfield converting means and the power consumption of the data driver is equal to or higher than the rated value. Since the use of the light emitting pattern can be avoided, it is possible to prevent the data driver from being destroyed and the image quality from being deteriorated due to the number of writing times being a predetermined number or more.

Further, in the plasma display device according to the fourth aspect of the present invention, the first and second row electrodes are formed on one substrate facing each other, and the first and second row electrodes are formed on the other substrate. The plasma display device requires a plasma display panel in which discharge cells are provided at intersections by forming column electrodes so as to be substantially orthogonal to the row electrodes, a drive circuit for driving the plasma display panel, and an input video signal. And a subfield converting means for converting into a signal in the order of inputting to the driving circuit and writing in front of the subfield converting means for determining a gradation to be used by the number of times of writing operation of the subfield in one field. Number of times control means and moving picture pseudo contour for determining lighting pattern of subfield for suppressing moving picture pseudo contour And a moving image detection signal for determining whether or not the image displayed on the plasma display panel is a moving image, and controls the operations of the writing number control unit and the moving image pseudo contour suppressing unit. Is.

Thus, when the moving image pseudo contour suppressing unit and the writing number control unit are continuously used, it is possible to prevent the gradation determined as the gradation not used in the preceding stage from being restored in the succeeding stage. It is possible to prevent the deterioration of the image quality due to the restoration of the gradation that is not originally used.

Further, in the plasma display device of the present invention, the writing frequency control means determines whether or not a predetermined subfield writing pattern is used by a data driver for applying a signal corresponding to a video signal to the column electrode of the plasma display panel. The feature is that it is determined by the power consumption for each field. The power consumption for each field is determined by the data driver power consumption prediction means.

This makes it possible to control the number of times of writing in consideration of the power consumption which is a direct cause of destruction of the data driver, and to prevent the destruction of the data driver even in the plasma display panel having any number of pixels. Therefore, it is possible to prevent the deterioration of the image quality due to the destruction of the data driver.

A plasma display device according to an embodiment of the present invention will be described below with reference to the drawings of FIGS.

(Embodiment 1) FIG. 1 shows a configuration diagram of a plasma display device according to Embodiment 1 of the present invention. In FIG. 1, the same parts as those shown in FIG. 8 are designated by the same reference numerals. There is.

The plasma display device shown in FIG.
The PDP 1, the data driver 2, the scan driver 3, the sustain driver 4, the error diffusion means 5, the moving picture false contour suppressing means 6, the subfield converting means 7, the write count controlling means 20, and the power consumption predicting means 21 are included.

The data driver 2, the scan driver 3 and the sustain driver 4 form a drive circuit for the PDP 1 and are connected to the respective electrodes of the PDP 1. Also, the error diffusion unit 5, the moving image pseudo contour suppressing unit 6,
The write count control means 20 and the subfield conversion means 7 are sequentially arranged on the path from the input signal side to the PDP 1.

The scan driver 3 has stable initialization discharge, write discharge, and stable discharge in all discharge cells inside the PDP 1.
In order to perform the sustain discharge and the erase discharge, in the initialization period including the sustain period of each subfield, the write period, and the erase period, the initialization operation, the sustain operation, the write operation, and the erase operation are performed. Generate a pulse.

Further, the sustain driver 4 is the PDP 1
In order to perform stable initializing discharge, writing discharge, sustaining discharge and erasing discharge in all internal discharge cells, initializing period including sustain period of each subfield, writing period and erasing period are initialized respectively. Pulses for operation, sustain operation, write operation and erase operation are generated.

Further, the data driver 2 has an error diffusion means 5, a moving picture false contour suppressing means 6, and a writing number control means in the writing period of each subfield so that the writing discharge can be performed in all the discharge cells inside the PDP 1. A write voltage pulse that turns on or off is generated in accordance with a video signal input via 20 and the subfield conversion means 7. As a result, the initializing operation, the sustaining operation, the writing operation, and the erasing operation are performed in a predetermined discharge cell, and an image is displayed on the PDP 1. Further, the power consumption predicting means 21 predicts the power consumption in the data driver 2 from a predetermined number of scanning lines of the PDP 1 or the like, and outputs a signal to the writing number control means 20.

FIG. 2 shows an example of the writing operation of each subfield in driving the plasma display device of FIG.

As shown in FIG. 2, one field is divided into eight subfields SF1 to SF8, and the weight of the emission luminance of each subfield is set to "1" and "2" in order from the beginning of the field in time order. , "4",
"8", "16", "32", "64" and "128"
In this case, a maximum of 256 gradations can be expressed by combining all the subfields.

For example, in the case of expressing the gradation "11", the write operation is performed in the write period of the subfields SF1, SF2 and SF4, and the write operation is performed a total of three times in one field to perform the subsequent light emission sustaining operation. This can be performed normally, and the gradation “11” can be expressed. In this case, the power consumption of the data driver, which increases in proportion to the number of writes in one field, consumes the power corresponding to three writes.

Here, in the case where the power consumption of the data driver reaches the maximum rating when the number of times of writing in one field is 6 or more, when the gradation "63" is expressed, the writing operation is from SF1 to SF6. A total of 6 write operations occur during the period, and the power consumption of the data driver reaches the maximum rating at this time, so the data driver may be destroyed. Further, when expressing the next gradation "64", the write operation is performed only in the write period of SF7, so that the power consumption of the data driver does not reach the maximum rating.

In the present invention, as shown in FIG. 1, before the subfield conversion is performed in the subfield conversion means 7, the write count control means 20 having a write count control table for limiting the write count is used in FIG.
As shown in, the gradation is not used for the gradation over 6 times, and the gradation is expressed by using the peripheral gradation where the number of times of writing is 5 or less.

For example, as shown in FIG.
In the case of expressing "5", it is necessary to perform writing six times in total in one field during the writing period in SF1 and SF3 to SF7. In this case, the power consumption of the data driver by the write operation is the maximum rating of the power consumption of the data driver. Will exceed. Similarly, when expressing the gradations “126” and “127”, it is necessary to perform writing 6 times and 7 times in total in one field, which exceeds the maximum rating of the power consumption of the data driver. In this case, these gradations are not used, gradations around them are used, and the gradations “124” and gradation “128”, which are the number of writing times 5 times and 1 time in one field, respectively, are used, and the error is Gradation is expressed by performing signal processing such as diffusion.

As a result, the number of times of writing in one field can be adaptively controlled even when the subfields are composed of various emission luminance weights or when various gradations are input. It is possible to control the increase in the power consumption of the data driver due to the increase in the number of times, and it is possible to prevent the destruction of the data driver due to the increase in the power consumption and the resulting deterioration of the image quality. Note that the weighting of the emission brightness does not have to be the value shown in FIG. 2, and the same effect can be obtained even if the other weighting of the emission brightness is performed. Also, in FIG. 2, the number of writings that reach the maximum rating of the power consumption in the data driver is set to 6 times or more in one field, but it is not necessarily six times and the number of writings that reaches the maximum rating of the power consumption of the data driver to be used. The same effect can be obtained by setting it to less than 1.

Further, FIG. 3 shows the write count control means 2
An example is shown in which 0 is arranged in the latter stage of the subfield converting means 7. In this case, the output signal of the subfield converting means 7 is used to determine the number of writings in one field at a predetermined gradation. The same effect can be obtained by determining whether or not a predetermined gradation is used and feeding back the result to the subfield converting means 7 as an output.

Further, FIG. 4 shows the write count control means 2
0 is arranged in the subsequent stage of the subfield converting means 7, and the subfield reverse converting means 22 is provided in the subsequent stage of the write control means 20.
Also, an example in which the subfield conversion means 23 is arranged is shown. In this case, however, the gray level which is not used in the writing control means 20 is inversely converted by the subfield inverse conversion means 22 to control the number of times of writing. Means 2
The number of times of actual writing can be reduced by sub-field converting the light-emission pattern which is not used at 0 into the light-emission pattern which is not used by the sub-field conversion means 23 again. When there is only one light emission pattern for a predetermined gradation, that gradation is set as an unused gradation and the gradation is represented by signal processing by using peripheral gradations.

Next, the operation in FIG. 4 will be described with reference to FIG. For example, as shown in FIG. 5, one field is SF
It is composed of 6 subfields from 1 to SF6, and the weights of the emission luminance are "1", "2", "4", and
In the case of “6”, “12”, and “20”, when the gradation “25” is expressed, the writing operation is performed in the writing period of SF1 to SF5, and the light emission sustaining operation is performed in SF1 to SF5. Therefore, the gradation “25” can be expressed.

Here, when the maximum power consumption rating of the data driver is reached when the number of times of writing in one field is 5 or more, the data driver may be destroyed by performing a total of 5 write operations in SF1 to SF5. is there. In this case, this light emission pattern is not used, and the data that is determined not to be used is output to the subfield inverse conversion means 22 in the subsequent stage. Next, when subfield conversion is performed again by the subfield conversion means 23, SF1, SF3, and SF6, which are emission patterns other than the emission patterns for initially lighting SF1 to SF5, are obtained.
The gradation "25" is expressed by performing the writing operation in the writing period. In this case, the number of writings in one field is three, and the data driver is not destroyed. As a result, the power consumption of the data driver can be reduced, and the deterioration of the image quality due to the destruction of the data driver can be prevented.

When the gradation "41" is expressed, SF
Since the write operation is performed 5 times in total in the write periods of 1, SF2, SF4, SF5, and SF6, this light emission pattern is not used, but the gradation "41" cannot be expressed other than this light emission pattern. , Gradation "4
“1” is the gradation “40” and the gradation “42” which are the peripheral gradations.
Is represented by signal processing such as error diffusion.

The weight of the emission luminance of each sub-field does not have to be the value shown in FIG. 5, and the same effect can be obtained with other weights of the emission luminance. Further, in FIG. 5, the number of times of writing to reach the maximum rating of the power consumption in the data driver is set to 5 times or more in one field, but it is not necessarily 5 times, and the maximum rating of the power consumption of the data driver to be used is reached. The same effect can be obtained by setting the number of writes.

Also, by using the power consumption predicting means 21, even if there are differences in the number of scanning lines depending on the panel in the PDP, the number of times of writing that reaches the maximum rating of the power consumption by the data driver can be predicted from the number of scanning lines. The same effect can be obtained in PDPs having any number of pixels.

(Second Embodiment) FIG. 6 shows a configuration diagram of a plasma display device according to a second embodiment of the present invention. The plasma display device shown in FIG.
DP1, data driver 2, scan driver 3, sustain driver 4, error diffusion means 5, subfield conversion means 7, field memory 24, moving image detection means 25,
It has a control means 26 including a moving picture false contour suppressing means and a writing number control means, and a power consumption predicting means 21.

The data driver 2, the scan driver 3 and the sustain driver 4 form a drive circuit for the PDP 1 and are connected to each electrode of the PDP 1. Further, the error diffusion unit 5, the control unit 26 including the moving image false contour suppressing unit and the writing number control unit, and the subfield conversion unit 7.
Are sequentially arranged on the path from the input signal side to the PDP 1. Further, a field memory 24 and a moving image detecting means 25 are arranged in parallel with the error diffusing means 5 and are connected to a control means 26.

Similar to the example shown in FIG. 1, the scan driver 3 sustains each subfield so that stable initializing discharge, writing discharge, sustaining discharge and erasing discharge can be performed in all discharge cells inside the PDP 1. During the initialization period, the writing period, and the erasing period including the period, pulses for the initializing operation, the sustaining operation, the writing operation, and the erasing operation are generated, respectively.

Similarly to the example shown in FIG. 1, the sustain driver 4 can also perform stable initialization discharge, write discharge, sustain discharge and erase discharge in all the discharge cells inside the PDP 1 in each subfield. In the initialization period, the writing period, and the erasing period including the sustain period, the initialization operation pulse, the sustain operation pulse, the write operation pulse, and the erase operation pulse are generated, respectively. Further, the data driver 2 can also perform the write discharge in all the discharge cells inside the PDP 1 as in the example shown in FIG.
A write voltage pulse that turns on or off is generated in accordance with a video signal input through the error diffusion unit 5, the control unit 26, and the subfield conversion unit 7 in the writing period of each subfield. As a result, the initializing operation, the sustaining operation, the writing operation, and the erasing operation are performed in a predetermined discharge cell, and an image is displayed on the PDP 1.

Further, the input signal is temporarily recorded in the field memory 24, and the video data in the two consecutive fields recorded in the field memory 24 by the subsequent motion picture detecting means 25 are compared to determine whether or not it is a motion picture. The moving image detection signal of is output to the control means 26. Further, the power consumption predicting means 21 predicts the power consumption in the data driver 2 from the predetermined number of scanning lines of the PDP 1 and outputs it to the control means 26.

FIG. 7 shows the writing operation of each subfield in driving the plasma display device shown in FIG. As shown in FIG. 7, one field is divided into eight subfields SF1 to SF8, and the weights of the light emission luminances of the respective subfields are “1”, “2”, and
When "4", "8", "16", "32", "64" and "128" are set, a maximum of 256 gradations can be expressed by a combination of all subfields.

For example, in the case of expressing the gradation "11", the write operation is performed in the write period of the subfields SF1, SF2 and SF4, and the write operation is performed a total of three times in one field to perform the subsequent light emission sustaining operation. This can be performed normally, and the gradation “11” can be expressed. In this case, the power consumption of the data driver, which increases in proportion to the number of writes in one field, consumes the power corresponding to three writes.

Here, in the case where the power consumption of the data driver reaches the maximum rating when the number of times of writing in one field is 5 or more, when the gradation "31" is expressed, the writing operation is the writing from SF1 to SF5. The write operation is performed 5 times in total during the period. At this time, since the power consumption of the data driver reaches the maximum rating, the data driver may be destroyed. Further, when expressing the next gradation, that is, the gradation "32", since the write operation is performed only in the write period of SF6, the power consumption of the data driver does not reach the maximum rating.

Further, after SF4, which is the weighting of the emission luminance corresponding to the gradation 8 corresponding to 1/32 of all 256 gradations, the emission pattern in the period until the end of the field includes two or more non-illuminated subfields. In the case of having a moving image, if the moving image pseudo contour reaches a level at which it can be easily confirmed in the moving image, the gradation "31" is hard to see, but the next gradation is the gradation "32" and the subsequent levels. The light emission pattern from the key “33” to the gradation “39” is at a level where the moving image pseudo contour can be easily confirmed, and this gradation cannot be used because the moving image pseudo contour is suppressed. Here, as shown in FIG. 6, before the subfield conversion means 7 performs the subfield conversion, the moving image pseudo contour means and the writing number control means by the control means 26 are used at the same time so that the number of writing times exceeds 5. In key
Moreover, when a light emission pattern of a level that allows easy confirmation of a moving image pseudo contour is used even when the number of writing times is four or less, the gradation is not used, and instead, the number of writing times in one field is four or less and It is expressed by using the peripheral gradation which becomes a light emission pattern of a level where the pseudo contour cannot be easily confirmed.

For example, as shown in FIG. 7, the gradation is "31".
In the case of expressing, the writing operation is performed in the writing period from SF1 to SF5. In this case, the moving image pseudo-contour is not at a level that can be easily confirmed, but it is necessary to perform writing five times in one field. The gray scale “31” cannot be used because the power consumption of the data driver exceeds the maximum rating of the power consumption of the data driver. Further, when expressing the gradation "39" from the gradation "32" which is the subsequent gradation,
The total number of times of writing in one field is 4 times or less, and the power consumption of the data driver does not exceed the maximum rating. However, in this case, the SF4
Since there is no writing in SF5 and SF5 and writing is performed in SF6 to turn on the light, the pseudo contour of the moving image can be easily confirmed. Therefore, if the field memory 24 and the moving image detecting unit 25 determine that the moving image is a moving image, the gradations “32” to “39” cannot be used. In this case, the gradations “31” to “39” are not used, and the gradations around the gradations are not used.
By performing the signal processing such as error diffusion using the gradation "30" and the gradation "40" which are the gradations of the light emission pattern in which the number of writing times in the field is four times or less and the pseudo contour of the moving image cannot be easily confirmed. Express gradation.

Next, a case where the motion picture pseudo contour suppression and the write count control are separately performed will be described with reference to FIG. When the moving image pseudo contour suppression is performed first, the gradations “32” to “39” are not used as in the above case. In this case, gradation "30" or "31" and gradation "40"
Alternatively, “41” is used to express gradation by performing signal processing such as error diffusion. When the write count control is performed next, similarly, the gradation "31" is not used. In this case, since the gradation "30" and the gradation "32" are used for the expression, the gradation "32" which should not be used for suppressing the false contour of the moving image is restored.

On the contrary, when the number of times of writing is first controlled, the gradation "31" is not used similarly. In this case, the gradation "30" and the gradation "32" are used to express the gradation by performing signal processing such as error diffusion. When moving image pseudo contour suppression is performed next, similarly, gradation "3
The gradation from "2" to the gradation "39" is not used. In this case, gradation "30" or gradation "31" and gradation "40"
Alternatively, since the gradation is expressed using “41”, the gradation that should not be used for controlling the number of writing is “31”.
Will be revived. Therefore, the image quality is deteriorated due to the destruction of the data driver or the false contour of the moving image due to the increase in the number of writing times.

Therefore, by using the control table in which the pseudo false contour suppression of the moving image and the number of times of writing are performed at the same time and the gradation is not restored, the case where the sub-field of various weights of the emission luminance is formed and the various gradations are changed. Even when input, the adaptive control of the number of writing times in one field and the suppression of the moving image pseudo contour can be performed at the same time. Moreover, compared with the case where the writing number control and the moving image pseudo contour suppression are performed separately, it is originally used. Since it is possible to control the number of times of writing without restoring the gray level and to suppress the false contour of the moving image, it is possible to control the increase in the power consumption of the data driver due to the increase in the number of times of writing, and to increase the data consumption due to the increase in the power consumption. It is possible to prevent destruction of the driver and deterioration of the image quality due to the destruction. Moreover, at the same time, it is possible to suppress a moving image pseudo contour even during a moving image, and it is also possible to prevent deterioration of image quality due to restoration of a gradation that is not originally used.

The weighting of the light emission luminance does not have to be the value shown in FIG. 7, and the same effect can be obtained even if the weighting of the other light emission luminance is performed. Further, in FIG. 7, the number of times of writing to reach the maximum rating of the power consumption in the data driver is set to 5 times or more in one field, but it is not necessarily 5 times and the maximum rating of the power consumption of the data driver to be used is reached. The same effect can be obtained by setting the number of times of writing less than the number of times of writing.

Further, by using the power consumption predicting means 21, even if there is a difference in the number of scanning lines depending on the panel, it is possible to predict the number of times of writing that reaches the maximum rating of the power consumption by the data driver from the number of scanning lines. Therefore, similar effects can be obtained in PDPs with any number of pixels.

[0059]

As described above, the present invention has the writing frequency control means for determining the gradation to be used according to the number of writing operations of the subfields in one field, so that the subfields of various emission luminance weights are provided. Even if the input is configured with or if various gradations are input, 1
Since the number of writes in the field can be adaptively controlled, the power consumption of the data driver due to the increase in the number of writes can be controlled, the data driver is destroyed due to the increase in the power consumption, and the image quality is deteriorated thereby. Can be prevented. Further, by simultaneously suppressing the moving image pseudo contour and controlling the number of times of writing, it is possible to suppress the moving image pseudo contour and control the power consumption of the data driver without deteriorating the image quality.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a plasma display device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a gradation expression method and a used gradation in the same device.

FIG. 3 is a block diagram showing a configuration of a plasma display device according to another embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a plasma display device according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a gradation expression method and a used gradation in the same device.

FIG. 6 is a block diagram showing a configuration of a plasma display device according to another embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a gradation expression method and a used gradation in the same apparatus.

FIG. 8 is a block diagram showing a configuration of a conventional plasma display device.

FIG. 9 is a perspective view showing a plasma display panel.

FIG. 10 is an explanatory diagram showing a driving timetable structure of a conventional plasma display device.

FIG. 11 is an explanatory diagram showing a gradation expression method in a conventional plasma display device.

[Explanation of symbols]

1 Plasma display panel 2 Data driver 3 scan driver 4 Sustain driver 7 Subfield exchange means 20 Writing Number Control Means 21 Power consumption prediction means 24 field memory 25 Video detection means 26 Control means

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 3/28 G09G 3/28 EF term (reference) 5C080 AA05 BB05 CC03 DD02 DD19 DD20 DD26 DD29 EE19 EE29 EE30 FF12 GG12 HH01 HH02 HH04 HH05 JJ02 JJ05 JJ06 KK43

Claims (6)

[Claims] 1. A first substrate and a second substrate on one of the substrates arranged to face each other.
And a plasma display panel in which discharge cells are provided at intersections by forming column electrodes on the other substrate and forming column electrodes on the other substrate so as to be substantially orthogonal to the first and second row electrodes. And a subfield conversion means for converting the input video signals into signals in the order required by the plasma display device and inputting the signals to the drive circuit. The number of subfield write operations in one field. Due to
A plasma display device comprising a writing frequency control means for determining a gradation to be used. 2. The plasma display according to claim 1, wherein the writing number control means is arranged in front of the subfield converting means and has a writing number control table for limiting the writing number. apparatus. 3. The plasma display according to claim 1, wherein the write count control means is arranged at a stage subsequent to the subfield conversion means, and a control signal from the write count control means is fed back to the subfield conversion means. apparatus. 4. A first substrate and a second substrate on one of the substrates arranged to face each other.
And a plasma display panel in which discharge cells are provided at intersections by forming column electrodes on the other substrate and forming column electrodes on the other substrate so as to be substantially orthogonal to the first and second row electrodes. And a subfield converting means for converting the input video signal into a signal of an order required by the plasma display device and inputting the signal to the driving circuit, and in the preceding stage of the subfield converting means, The plasma is provided with writing number control means for determining a gradation to be used according to the number of writing operations of subfields in one field and moving image false contour suppressing means for determining a lighting pattern of the subfield for suppressing moving image false contours. The video detection signal that determines whether the video displayed on the display panel is a video The plasma display apparatus characterized by controlling the operation of said write number control means and the moving image pseudo contour suppression means. 5. The write count control means determines the write count in a predetermined subfield write pattern by the power consumption per field of a data driver for applying a signal corresponding to a video signal to a column electrode of a plasma display panel. Claim 1 characterized by the above.
Alternatively, the plasma display device according to item 4. 6. The plasma display device according to claim 5, further comprising power consumption prediction means for determining the power consumption of each field of the data driver.